<html>
  <head></head>
  <body>
    Creates an Attribution source on load.
    <script>
      window.attributionReporting.registerAttributionSource({
        attributionSourceEventId: '1',
        attributionDestination: 'https://a.example',
        attributionReportTo: 'https://b.example',
      });
    </script>
  </body>
</html>
